18 He who believes in Him [who clings to, trusts in, relies on Him] is not judged [he who trusts in Him never comes up for judgment; for him there is no rejection, no condemnation—he incurs no damnation]; but he who does not believe (cleave to, rely on, trust in Him) is judged already [he has already been convicted and has already received his sentence] because he has not believed in and trusted in the name of the only begotten Son of God. [He is condemned for refusing to let his trust rest in Christ’s name.]

Cross references:

18 People who believe in God’s Son are not ·judged guilty [condemned]. Those who do not believe have already been ·judged guilty [condemned], because they have not believed in [L the name of] God’s ·one and only [only; unique; T only begotten; 3:16] Son.

10-21 “So you are a teacher of Israel,” said Jesus, “and you do not recognise such things? I assure you that we are talking about something we really know and we are witnessing to something we have actually observed, yet men like you will not accept our evidence. Yet if I have spoken to you about things which happen on this earth and you will not believe me, what chance is there that you will believe me if I tell you about what happens in Heaven? No one has ever been up to Heaven except the Son of Man who came down from Heaven. The Son of Man must be lifted above the heads of men—as Moses lifted up that serpent in the desert—so that any man who believes in him may have eternal life. For God loved the world so much that he gave his only Son, so that every one who believes in him shall not be lost, but should have eternal life. You must understand that God has not sent his Son into the world to pass sentence upon it, but to save it—through him. Any man who believes in him is not judged at all. It is the one who will not believe who stands already condemned, because he will not believe in the character of God’s only Son. This is the judgment—that light has entered the world and men have preferred darkness to light because their deeds are evil. Anybody who does wrong hates the light and keeps away from it, for fear his deeds may be exposed. But anybody who is living by the truth will come to the light to make it plain that all he has done has been done through God.”

16-18 “This is how much God loved the world: He gave his Son, his one and only Son. And this is why: so that no one need be destroyed; by believing in him, anyone can have a whole and lasting life. God didn’t go to all the trouble of sending his Son merely to point an accusing finger, telling the world how bad it was. He came to help, to put the world right again. Anyone who trusts in him is acquitted; anyone who refuses to trust him has long since been under the death sentence without knowing it. And why? Because of that person’s failure to believe in the one-of-a-kind Son of God when introduced to him.

18 The one of emunah who is mekabel Moshiach (accepting the person of the Ben HaAdam, Rebbe, Melech HaMoshiach) is not judged; but the one without emunah who is not mekabel Moshiach, already has been judged and given the psak din (verdict) of "condemned," because he has no emunah in the Shem of the Ben Yachid of Hashem.

18 He that believeth in him, is not deemed; but he that believeth not, is now deemed [He that believeth into him is not deemed, or condemned; forsooth he that believeth not, is now condemned], for he believeth not in the name of the one begotten Son of God.